It’s a trivia question that would have stumped most: who is the active leader in strikeouts among right-handed pitchers? Until this morning, the answer was Kevin Millwood, at 2,083. Now it’s Roy Halladay, just 17 behind at 2,066, after Millwood announced his retirement. An 11th-round pick by the Braves in 1993, Millwood opened his career…